​3. Insert your customer id in the first column under the customer ID header. In the second column, the header should be the name of your new Profile attribute (ie. “Test Users”) and the value set for each customer ID could be the users name or just a simple Yes value. (At anytime, you can add additional customer IDs to this profile attribute by simply re-uploading the CSV with newer customer IDs added. Any existing customer IDs in the file will just get re-written.) Then save the file.

Navigate back to the Profile tab in the dashboard and select Action–>Upload CSV. Choose Upload to Your Org and Choose a file to Import

Select your CSV file and upload to the dashboard. Once uploaded, it can take roughly 5-10 min​utes for the profiles to update on the Localytics backend and be targetable from the Audience tab.

Lastly, create your audience including the new Profile attribute “Test Users is one of xx”